Fungicidal compositions comprising copper-8-quinolinolate solubilized with heavy metal salts of alkyl phosphoric acid esters



K'FUN GICIDAL COR [POSITIONS COMPRISING COP- 'PER S-QUINOLINOLATE SOLUBIIJIZED HEANY METAL-SALTS OF AIJKY-L'PHOSP-HORIC .ACID :ES'IFERS 8 Claims. (21. 167-33) The 'present invention relates to compositions for immaterials. More particularly, the present invention relates to. fungicidal compositions containing copper-S quin- -olinolate -which compositions are-soluble in' liquid organic media.

Copper-8-quinolinolate, .thecopper salt of 8-hydroxyquinoline, is Well known to be an efiectivefungicide and has obtained widespread use in "the textile field .as a mildew-proofing agent and preservative 'for textile materials, particularly for-such materials which are destined for use out-of-doors and 'WhiCh "maybe .subject to all manner of Weather conditions. However,this compound is substantially insoluble in water'and in the organic media normally "employed in the treatment of textiles, and iforpractical 'op'er-ati'onshas been generally utilizedv in .the form of a dispersion 'thereof in 'a'liquid carrier containing suitable binder materials "which, upon -application. to textile ma- "terialsand upon subsequent drying an-d curing operations, bind 'the copper-8-quinolinolate 'to the'fibers of the ma terials treated. While such compositions aresatisfactory for many purposes, their'use is also often undesirahlesince the binder materials used therein :generally'have. a tend- -ency to stiffen the fabrics treated therewith .or to cause excess weighting thereof. Furthermore, even when such copper-S-quinolinoate dispersions are ,ground to an extremly 'fine particle size, the fungicide *tends'to deposit only on "the surface of the treated textile: and. does not penetrate the innermost'fibers. "This isparticularly true when very heavy 'or tightly woven fabrics are being treated. "This localization of the copper-"B-quindlindlateron the surface of the treated .fabrics vgenerally ;results in an excessive tendency to crock,that"is, 'torubofi, and will produce greatly reduced mildew protection. In many cases, therefore, ,it "would be preferable [if the copperquinolinolate could be incorporated .into textilefibers directly, that is, in the form of a true solution and without the use of resinous binder materials, and in such form as tobe substantially completely resistant to removal therefrom by rubbingor other mechanical abrading ast-ions and also resistant to removal bywater such as winnorm'al Washing operations or as "might occur *under =outdor weathering conditions.

Therefore, one object of -the present invention is-to. provide a "fungicidal composition containing 'copper 8- quinolinolate which-is adapted to be utilized-in 'the treatment of textile materials in theformof -a solution 'thereof to impart highly durable fungicidal and preservative 'properties-thereto.

Another object of the ,present invention is 'to' provide a fungicidal composition containing copper-8-quinolin6late, which composition is insolublein water but is Soluble in .t:herrorganic media commonly utilized-tintthewtreatment of textilematerials.

.''A-nother TObjfiCt of the presentt inventionj'is zjltovzprovide processes :for preparing s-solubleirfungicidal ccompositions zcontainingucopper 8equinolinolate.

United States Patent -0 parting fungicidal propertiesuo textiles and likecellulosic :Other objects :of the present invention will :beapparent from -:the ;following description and .appended .claims.

In accordance with the present invention, a ifungicidal composition containing copper-S-quinolinolate which is soluble :in organic media but is insoluble in .Water and whichais adapted to "be-utilized 'in the t-reatmentofcel'lulosic textile materials to impart durable fungicidalgproperties thereto, may be preparediby'heating copper-fiaquinolinolateina suitable organic solvent with aiheavyrmetal salt of 2a. material of the, group 1 consisting of the monoalkyl .acid estersand .thedialkyl acid esters of the phosphoric acids, such .as orthophosphoric acid .and pyrophosPhoric acid, and of mixtures ofp-such-esters.

-We have also found thatthe monoalkyl acidp-estersiantl .the :dialk-yl acid esters of the phosphoric :acids :are, ;of themselves, 'solubilizers vfor I copper-LS-quinolinolateainror- ,ganic media 1 such: as the aliphatic; and :aromaticahydroearvbonsolvent-s. :However, solutions of copper-,8-;quinolino- .late-in organicmedia in-which thersaidqacid'estcrstofithe phosphoric acids are employed as the solubilizers are :strongly .acidic and are, therefore, .completelytimpractical ,for use the treatment of .cellulosic textile :materials due .to then-deteriorating. effect of the acidity; of .the. impregnating solution'onthe treatedifabric, eventhough the treated .fabric may subsequently be neutralized. Attempts tat neutralization of such solutions only result in the precipitation 0f the -coppere8-quinolinolate, thus destroying tthe usefulness of these compositions was textile treating agents. With .the useof thezheavy metal salts of these: acid .phos- ,pha-tes .asithe solubilizers'forzcoppen8-quinolinolatezin or- ;ganic solvents, -mineral acidity of solutions containing .the' solubilized coppenfiaquinolinolatez is completely-avoided. 51 he, present invention, therefore providesatextileztteat- ,ing solutions(of copper-8-quinolinolatein organic'solvent's .which-solut-ions are substantially neutral, have, no adverse effect ion ,fabrics treated therewith, and -which,-.require;:no subsequent ztreatment. of the fabric such as the ;.neutr;aii- .zation treatment required when the fabrics are =trea-ted with solutions of an acid character. In viewcof rtheifact thattheattempts-atneutralization-of solutions ofccopper-ii- .quinolinolate containing i thev acid, phosphates 53S iSQll-lbilll- .ers, prove futile as far as-.obtainh1gmeutralizedzsclutions of.copper-8 quinolinolate inorganic mediawasconcemed, it wassentirely unexpected, nor could. itibe :predicted,::that the neutral-heavy metal salts of I the. said, acid :phosphates would provide. completely solubilized1copper8equindlirtolate compositions. -.What is --,even more surprising isrthe ,factthat therheavy. metal. salts. .of-the-said; aaci'd; phosphates display, in general, agreatersolubilizing :action upontcopper-,8 quinolinolate in organic media than do fthercorre- .sponding .acidrphosphates themselves.

As..exatnples of-th-e monoalkyland-dialleyl acid {esters of.thegphosphoricsacids the heavy metal salts :ofuwliich may .be employed. in. the practice of the gpresentinventicn .there may be ment-ioned monoisoamyl .acidfi-orthophosphate, .amyl octyL-acid orthophosphate, :ethyl lauryhaid .orthophosphate, ethylqoleyl :acid .orthophosphate rand sdi- .octyl.acid;-pyrophosphate. For-the, PHITPOSfiSsOfthB pnesent invention, the said compounds may comprisezmixtures iOf the .monoallgtyl sand ,the dialleyllzacid esters -.of :the;ph osphoricacids. :Thus, mono dioctylsacidnorthophohate, which .is. a-vcomrnercial producttcontainiug approximately 42% ,of .rmonocctyl aacid .orthqphosphate, approximately 53% .of dioctyl .acidtorthophosphate and approximately .5. %...of v.trioct-yl .acid torthophosphate .and .of :free :phosphoric acid,z.is.-also.suitablefor use inthepresentinven- .tion. .Sincethe; heavyrmetal tSflilIS Of-bOfll; the monoalkyl acid. esterszand of. the. .dialkyl-acidsesters Ofrthfi; phosphoric acids-arersuitable-individually; for. carrying out ;-the present mvention ttheiratio-.oftherrnonoalkyl estereto: ;the:diallryl ester in those mixtures of the monoalkyl and of .theailialkyL-zesters-whiclharewemployed-tindhe formioft themeavy metal salts thereof is immaterial as far as the accomplishment of the desired result is concerned. It has been found that the heavy metal salts of substantially any combination of the above described esters of the phos phoric acids may be employed in carrying out the present invention.

Generally any of the heavy metal salts of the monoalkyl and of the dialkyl acid esters of the phosphoric acids may be employed in preparing the compositions of the present invention. Suitable metal salts of the said phosphoric acid esters which may be utilized are the salts of nickel, zinc, copper, lead, iron, cobalt, manganese and w chromium, for example. It has also been found that the aluminum salts of the aforementioned esters of the phosphoric acids may also be employed in preparing the compositions of the present invention. Of these materials, it is preferred to employ the nickel salts since the compositions comprising these salts and copper-S-quinolinolate are generally more highly soluble in organic media than are those in which the other metal salts of the above mentioned acid esters are employed, thus permitting greater concentrations of the fungicidal compositions in the organic media used as the solvent or carrier therefor. However, all of the compositions of the present invention have sufiicient solubility in organic solvents to permit concentrations thereof in the textile treating baths which are adequate for imparting highly fungicidal and preservative properties to textile materials treated there- In the treatment of textiles and the like, a treating bath comprising a solution of a fungicidal composition of the present invention in a suitable organic solvent or mixture ofsuch solvents is prepared. Suitable solvents for such .use include xylene, toluene, benzene, naphtha, mineral .treated therewith will depend upon the type of fabric which is to be treated, thatis, upon the absorptive properties of the fabric to be treated, upon the concentration of the fungicidal composition in the treating bath, and

upon the quantity of copper-8-quinolinolate in the particular fungicidal composition employed. For practical purposes, completely effective fungicidal properties are imparted to textile materialslwhen such materials contain within their fibers from approximately 0.75 to 1.5% by weight of copper-S-quinolinolate based upon the dry weight of the fabric. Therefore, for best results, the concentration of the fungicidal composition in the treating bath should be such as to enable the pick-up by the fabric of such an amount of the said composition as to provide the equivalent of from approximately 0.75 to 1.5% by weight of copper-8-quinolinolate based on the dry weight of the fabric.

In preparing the fungicidal composition of the present invention, a heavy metal salt of an acid phosphate of the type hereinbefore described or an aluminum salt of such acidphosphate is formed in situ in:an organic solvent which is to act as the azeotroping agent for the byproducts formed during the salt forming reaction and as the diluent or solvent for the finished composition. When formation of the metal salt of the acid phosphate has been completed, copper-S-quinolinolate is then added thereto and the materials are heated until substantially complete solution of the copper-S-quinolinolate is obtained.

. In carrying-out this -process,..a monoalkyl or a dialkyl acid ester of orthophosphoric or pyrophosphoric acid, an organic solvent, and a metal supplying compound such as a heavy metal salt of acetic acid, for example, are charged to a vessel equipped for refluxing and for azeotropic distillation. The amount in which the metal supplying compound used in preparing the metal salts of the acid phosphates hereinbefore described, is to be employed in carrying out the process is usually determined by the amount of metal required to replace the available hydrogen atoms of the particular acid phosphates utilized. However, an excess of metal over that required to form salts with the acid esters of the phosphoric acids may sometimes be used to advantage. The mixture thus charged is then refluxed until a completely clear solution of the reaction materials in the solvent has been obtained, any water or acetic acid formed during the reaction being removed from the reaction mixture by azeotropic distillation. Heating is then discontinued to allow the addition of copper-8- quinolinolate. to the reaction mixture and the whole is then again refluxed till substantially complete solution of the copper-S-qninolinolate has been obtained.

be following examples are illustrative of the preparation of the fungicidal compositions of the present invention. All parts given therein are given as parts by weight.

Example 1 temperature till all of the copper-S-quinolinolate has entered into solution. There is thus obtained a clear, dark green solution of a composition capable of imparting highly effective fungicidal properties to textile materials,

the said solution containing approximately 9.5% by weight of copper-8-quinolinolate based on the weight of the solution.

A satisfactory bath for treating textile materials may be prepared by diluting the solution obtained above with xylene, Stoddard solvent, or other compatible organic solvents in such amount as to provide a solution containing from approximately 1 to 4% by weight of copper-8- quinolinolate. A ratio of 4 to 5 parts of diluent to 1 part of the above solution has been found to furnish textile treating baths satisfactory for imparting effective fungicidal and preservative properties to textile materials treated therewith in accordance with the present invention.

Example 2 28 parts of amyl octyl acid olthophosphate, 11 parts of zinc acetate, and 60 parts of xylene are refluxed in admixture till a clear solution of the reaction materials is obtained. Any water or acetic acid formed during the reaction is removed by azeotropic distillation as the reaction occurs. When a clear solution of the reaction materials has been obtained, heating is discontinued while there are added thereto 5 parts of copper-8-quinolinolate.

The mixture is then heated to boiling and held at such gether as in Examples 1 and 2 till a clear solution of the reaction materials in the xylene has been obtained, the water and acetic acid formed during the reaction being of the said solution.

removed by azeotropic distillation. 8.5 parts of copper-8- quinolinolate are then added 'to the solutionwhich is then heated at its boiling-temperature tillthe coppe'r-8-quinolinolate has completely enteredintosolutiontherewith. The resulting solution contains approximately 10.6% by weight ofcopper-Squinolinolate.

Example 4 .30 parts of monodioctyl acid orthophosphate, *9 parts of basic aluminum acetate powder and "50 parts of xylene are r-refiuxed ztogether as -in the preceding examples till solution of theJreaction' mater-ials the'xylene has been obtained. :With thesematerials, the solution obtained is slightly turbid. ilheaso'lutionis"then filtered to remove all material 'which hasinot cornpletely dissolved,-and to the'filtrate Jthereaare added 4L5'parts of copper-S-quinolinolate. T he"solution.containing 'the added 'copper-8-quinolinolate is thenlheated to boiling and maintained at such temperature itill the copper=8-quinolinolzite has dissolved completely. .To .thisisolution there are then added '30 parts: of .parafiin 1 ware and: heatingiiis: continued with agitation until the wax has dissolved completely. Up'on cooling to room temperature, .therresultantzproducb is a soft, dark green paste containing approxirnatelyl3l7 5% by weight of copper-8-quinolinolate.

A Itextile treating bath was :prepared -by diluting the paste product obtained according to Example -4 with Stoddardsolvent in thearatio .of 47 parts of :Stoddard. solvent to 53 partsof?the 'sai'd paste'produc't. Arsam'ple'of cotton duck was padded through. the treating bath in .such manner'as to obtain-21.50% \wet pick-up of'the treating solution .and was then dried. The treated fabric was found tocontain approximately 110% :by weight :based :on the weight of the fabric oficopper-8-quinolinolate. Waterrepellencydests upon-the treated fabric showed a spray rating 05100. Upon: leaching thetreate'difabric in running Water:for24- hours followed by burial'in the ground for .28 days,.no appreciable -growth of-wmi-ldew was apparent nor was there any appreciable loss of tensile strengthdn the fabric. .An untreated sampleof the tsame't-ype of fabric, subjected to the. same .leach'ingrand soil burial treatment, was found to .havedeteriorated completely after 6 days burial.

Example .5

admixture till a clear-solution-of the reaction materials in the Xylene has *been obtained, "the water and acetic acid formed therein being 'removed frorn the reaction zone by azeotropic distillation I during the course "of the reaction. When 'completesolution of thereact-ion materials in the solvent has been eflfected, heating is discontinued while there are added' thereto' 2.5 partso'fcopper 8-quinolinolate. Themixture is again heatedto boiling and maintained at such temperature till complete solution of the .copper 8+quinolinolate has "been obtained. The solution thus obtainedcontains approximately'11% by weight of copper-8 quinolinolat'e.

AItreating'solution suitable'for thetreatment of thread is preparedkby dilutingthe solution obtainedin Example 5 with xylenein the ratioof 91 parts of xylene to 9 parts Cotton thread was treated with the diluted treatingsolution in a-package-machine, followed by hydroextraction to awet pick-up of 100% by weight. The treated thread, after-drying to removethe volatile solvent, wasfound to contain approximately 1 .0' by weight based: ou the weight of thethread of copper-8- quinolinolate. The treated thread was found to-havelost not more than 5% in tensile strength after soil burial for 14 days.

of basic aluminum acetate powder an'd50 parts of xylene are refluxed together till substantially complete solution vlects in the razeotropic separator.

of the reactants is secured, the water andaceticacid being removed therefrom as "in the preceding examples. "A'slightly 'tui-bidsolutionis obtained-Whichmay be'filtered to'secure-a clean solution'of the reaction materials. After filtration, 3.5-parts o'f copper 8-quinolinolate are added to the cleariiltrateand the "mixture isheated at boiling temperature till complete solution of 'the copper-8- 'quino'linolate has been obtained. This "solution contains approximately 4% by weight of 'copper-'8 quinolinolate.

Example 7 '60 parts of dioctyl acid "pyroph'osphate, 1255parts of nickel acetate and 97. 5 -parts 0fLxylene are refluxed in admixture till aclear solution of the reaction materials "in the xylenei-is "obtained, any water and acetic acid formed as byproducts of the reaction being removed 'there'fromby a-zeotropic distillation. When a clear solution is obtained, heating is discontinued and 10 parts "of copper-S-quinolinolate are added to the solution. The

solution containing the added copp'er-8-quinolinolate is *againnheatedto reflux temperature'andkept at such'tem- 'perature alien-er the copper 8-quinolinolate has entered into-solution, yielding a solution containing approximately 4.7% by weight of-copper-8 quinolinolate.

Instead of utilizing preformed copper-S-quinolinolate inipreparingthe compositions; of the present invention, it is equally satisfactory to employ 8 hydroxyquinoline to- --gether with a suitable -copper--containing oompound in correct -'s'toichiorrretrical arnounts so as to form copper=8- quinolinolate' in situ in the solution containing a heavy ametal sal t of the -acid phosphates hereinbefore described. 'Up'on heating, -a "composition cOntaining "solubiliz'ed copper-S quinolinoIate -is obtained. Example 8 .309 :parts IOfJmIOHO-Zdl-H- OCWI Iacid rorthophosphate, 1200 :parts of :n'rokeltacetate and 5700 parts ofxylol :are refluxed together until substantially.:-no ifurtherwaterrcol- 120.:parts ofwcopper acetate are ithensadd'eduhereto and refluxing: is resumed until the collection-of water again :ceases. 1'65v partsfof 8-hydroxyquinolinez are now' added to the solutionwhereupon a greenishiprecipitatelforms which dissolvesmompletely on continued rheating. To this solution there :are

- of .the paste obtained .in :Example '8 with parts of Stoddard solvent until-a clear solution of :thewsame .is obtained. Cotton=webbing:is padded through thetreating bath so .as toacquire a wet ,pickeup of about 50% by Weight based on the weight of rthe: said webbing .and the treated webbingais then passed-over dry 1cans=to .drive off the volatile,solvents-contained in:theeimpregnated fabric. The thus treated webbing contains approximately 1.0% -.by Weight-of copper-8-quinolinolate, .is water-resistant, land :is substantially mildew-proof as is evidenced by the fact that'- itshowsta. dynamic absorbency of 25% andshows-no loss in tensile strength :after ssoil burial for .35 days. The test forthe dynamicabsorbeney of a fabric isdescribed intFederal. Specification-CGC-iT- 19.1b.

As prepared-in the illustrative examples setforth above,

the solutions containing the 'solubilized copper 8-quinolinolate .are in a [more concentrated form than is :requiredfor-theelfe'ctivettreatment of textile materials .and are therefor. usually diluted with atsuitable organiosolvent at the-time of the treatment of the fabricin such amounts as to allow the deposition of any :desired amount :;of

.copper-B-guinolinolate uponitheimaterial zto'zbe treated.

N0 binder materials need be added to either the treating baths nor to the treated textile materials to insure retention of the fungicidal compositions upon the fibers for, due to the form and manner in which they are employed in the present invention, these materials are substantially completely resistant toward removal thereof from the treated fabrics under substantially all normal conditions of use. This, however, does not preclude the use of resinous binder materials with the compositions of the present invention, particularly incombination with coloring materials such as dyes or pigments, nor does it preclude the use therewithof various textile treating compositions ordinarily employed to impart water-repellency, fire-resistance, etc. to textile materials. The solutions described above may also be employed as components of textile treating emulsions where, for various reasons, it may be preferable to employ an emulsion rather than a solution in the treatment of textiles.

What is claimed is:

l. A composition adapted for the treatment of textile materials to impart fungicidal and preservative properties thereto comprising a, substantially neutral solution prepared by mixing a fungicidal amount of copper-8- quinolinolate and a neutral heavy metal salt of a material selectedfrom the group consisting of the monoalkyl and the dialkyl acid esters of orthophosphoric acid and pyrophosphoric acid dissolved in a liquid hydrocarbon solvent therefor, wherein said heavy metal is a metal selected from the group consisting of nickel, zinc, copper, lead, iron, cobalt, manganese and chromium, and said alkyl group contains from 2 to 18 carbon atoms, and heating said mixture at a temperature and for a time sufficient to solubilize said quinolinolate, the amount of said salt being in excess of the amount of said quinolinolate on a weight basis and the amount of said salt being sufficient to solubilize said quinolinolate at the boiling temperature of said solvent, and said solvent being substantially inert to the other ingredients.

2. A composition adapted for the treatment of textile materials to impart fungicidal and preservative properties thereto comprising a substantially neutral solution prepared by mixing a fungicidal amount of copper-8- quinolinolate and a neutral heavy metal salt of amyl octyl acid orthophosphate dissolved in a liquid hydrocarbon solvent therefor, wherein said heavy metal is a metal selected from the group consisting of nickel, zinc, copper, lead, iron, cobalt, manganese and chromium, and heating said mixture at a temperature and for a time sufiicient to solubilize said quinolinolate, the amount of said salt being in excess of the amount of said quinolinolate on a weight basis and the amount of said salt being sufficient to solubilize said quinolinolate at the boiling temperature of said solvent, and said solvent being substantially inert to the other ingredients.

3. A composition adapted for the treatment of textile materials to impart fungicidal and preservative properties thereto comprising a substantially neutral solution prepared by mixing a fungicidal amount of copper-8- quinolinolate and the neutral zinc salt of amyl octyl acid orthophosphate dissolved in a liquid hydrocarbon solvent therefor, and heating said mixture at a temperature and for a time sufiicient to solubilize said quinolinolate, the amount of said salt being in excess of the amount of said quinolinolate on a weight basis and the amount of said salt being sufficient to solubilize said quinolinolate at the boiling temperature of said solvent, and said solvent being substantially inert to the other ingredients.

4. A composition adapted for the treatment of textile materials to impart fungicidal and preservative properties thereto comprising a substantially neutral solution prepared by mixing a fungicidal amount of copper-8- quinolinolate and a neutral heavy metal salt of monoisoamyl acid orthophosphate. dissolved in a liquid hydrocarbon solvent therefor, wherein said heavy metal is a sufiicient to solubilize said quinolinolate, the amount of said salt being in excess of the amount of said quinolinolate on a weight basis and the amount of said salt being sufficient to solubilize said quinolinolate at the boiling temperature of said solvent, and said solvent being substantially inert to the other ingredients.

5. A composition adapted for the treatment of textile materials to impart fungicidal and preservative properties thereto comprising a substantially neutral solution prepared by mixing a fungicidal amount of copper-B-quinolinolate and the neutral copper salt of monoisoamyl acid pyrophosphate dissolved in a liquid hydrocarbon solvent therefor, and heating said mixture at a temperature and for a time sufficient to solubilize said quinolinolate, the amount of said salt being in excess of the amount of said quinolinolate on a weight basis and the amount of said salt being sufiicient to solubilize said quinolinolate at the boiling temperature of said solvent, and said solvent being substantially inert to the other ingredients.

6. A composition adapted for the treatment of textile materials to impart fungicidal and preservative properties thereto comprising a substantially neutral solution prepared by mixing a fungicidal amount of copper-8- quinolinolate and a neutral heavy metal salt of ethyl lauryl acid orthophosphate dissolved in a liquid hydrocarbon solvent therefor, whercin said heavy metal is a metal selected from the group consisting of nickel, zinc, copper, lead, iron, cobalt, manganese and chromium, and heating said mixture at a temperature and for a time sutficient to solubilize said quinolinolate, the amount of said salt being in excess of the amount of said quinolinolate on a weight basis and the amount of said salt being suflicient to solubilize said quinolinolate at the boiling temperature of said solvent, and said solvent being substantially inert to the other ingredients.

7. A composition adapted for the treatment of textile materials to impart fungicidal and preservative properties thereto comprising a substantially neutral solution prepared by mixing a fungicidal amount of copper-8- quinolinolate and a neutral heavy metal of dioctyl acid pyrophosphate dissolved in a liquid hydrocarbon solvent therefor, wherein said heavy metal is a metal selected from the group consisting of nickel, zinc, copper, lead, iron, cobalt, manganese and chromium, and heating said mixture at a temperature and for a time suflicient to solubilize said quinolinolate, the amount of said salt being in excess of the amount of said quinolinolate on a weight basis and the amount of said salt being sufficient to solubilize said quinolinolate at the boiling temperature of said solvent, and said solvent being substantially inert to the other ingredients.

8. A composition adapted for the treatment of textile materials to impart fungicidal and preservative properties thereto comprising a substantially neutral solution prepared by mixing a fungicidal amount of copper-S-quinolinolate and the neutral nickel salt of dioctyl acid pyrophosphate dissolved in a liquid hydrocarbon solvent therefor, and heating said mixture at a temperature and for a time sufficient to solubilize said quinolinolate, the amount of said salt being in excess of the amount of said quinolinolate on a weight basis and the amount of said salt being sufiicient to solubilize said quinolinolate at the boiling temperature of said solvent, and said solvent being substantially inert to the other ingredients.

References Cited in the file of this patent UNITED STATES PATENTS 

1. A COMPOSITION ADAPTED FOR THE TREATMENT OF TEXTILE MATERIALS TO IMPART FUNGICIDAL AND PRESERVATIVE PROPERTIES THERETO COMPRISING A SUBSTANTIALLY NEUTRAL SOLUTION PREPARED BY MIXING A FUNGICIDAL AMOUNT OF COPPER-8QUINOLINOLATE AND A NEUTRAL HEAVY METAL SALT OF A MATERIAL SELECTED FORM THE GROUP CONSISTING OF THE MONOALKYL AND THE DIALKYL ACID ESTERS OF ORTHOPHOSPHORIC ACID AND PYROPHOSPHORIC ACID DISSOLVED IN A LIQUID HYDROCARBON SOLVENT THEREFOR, WHEREIN SAID HEAVY METAL IS A METAL SELECTED FROM THE GROUP CONSISTING OF NICKEL, ZINC, COPPER, LEAD, IRON, COBALT, MANGANESE AND CHROMINUM, AND SAID ALKYL GROUP CONTAINS FROM 2 TO 18 CARBON ATOMS, AND HEATING SAID MIXTURE AT A TEMPERATURE AND FOR A TIME SUFFICIENT TO SOLUBILIZE SAID QUINOLINOLATE, THE AMOUNT OF SAID SALT BEING IN EXCESS OF THE AMOUNT OF SAID QUINOLINOLATE ON A WEIGHT BASIS AND THE AMOUNT OF SAID SALT BEING SUFFICIENT TO SOLUBILIZE SAID QUINOLINOLATE AT THE BOILING TEMPERATURE OF SAID SOLVENT, AND SAID SOLVENT BEING SUBSTANTIALLY INERT TO THE OTHER INGREDIENTS. 